First I apologize, but looks like i'm not able to load the images properly....Second: HELP !!! ( blind faith in our moderator...) where i can find the schematics and the purpose of a "console interface board" that seems to connect auxes and groups to a rear faced EDAC connector?I hope this is a backdoor to summing the auxes to the busses ( i have the matrix groups, not the aux return ones)Any help wellcomeThankPaolo

Thank Gareththose schematics are the ones i'm using in debugging the channels (very few problems indeed, is a real workhorse) but, unless i've overlooked them, no trace of that board inside them.I'll try to take pictures of it, it looks as a customization and, as long i've understood, it buffers the signals from an EDAC connector to the internal busses, like an expansion cable for a sidecar or so.For me is interesting to see if i can return the effects from auxes to the bus system, due the fact i have the "matrix" groups.Anyway, great engineering to explore, some practical licks in the construction are telling me of how much care was taken in the project .